Just FYI you can do this currently, you just need an additional firewall. We have a couple setups utilizing Sonicwalls for 3rd party VPN in this setup because Meraki's 3rd-party IPSEC implementation is straight garbage that will disconnect randomly and not reconnect until you manually reset the tunnel. I'm hoping the IKEv2 beta release will be more stable. https://www.willette.works/merging-meraki-vpns/
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